You've probably noticed running shoes have gotten expensive. Like, really expensive. The days of grabbing a solid pair for under $100 are mostly gone, and now we're seeing shoes that cost more than some people's monthly grocery bills. But what exactly are you getting when you drop $300+ on running shoes? We combed through Amazon's running shoe offerings to find the most expensive options available. Here's what's commanding those premium prices—and whether they're actually worth it. The $300+ Clu